[mirror_ubuntu-artful-kernel.git] / net / ax25 / ax25_route.c

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
 * Copyright (C) Steven Whitehouse GW7RRM (stevew@acm.org)
 * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
 * Copyright (C) Hans-Joachim Hetscher DD8NE (dd8ne@bnv-bamberg.de)
 * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr)
 */

#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/timer.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/slab.h>
#include <net/ax25.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <net/sock.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/seq_file.h>
#include <linux/export.h>

static ax25_route *ax25_route_list;
static DEFINE_RWLOCK(ax25_route_lock);

void ax25_rt_device_down(struct net_device *dev)
{
	ax25_route *s, *t, *ax25_rt;

	write_lock_bh(&ax25_route_lock);
	ax25_rt = ax25_route_list;
	while (ax25_rt != NULL) {
		s       = ax25_rt;
		ax25_rt = ax25_rt->next;

		if (s->dev == dev) {
			if (ax25_route_list == s) {
				ax25_route_list = s->next;
				kfree(s->digipeat);
				kfree(s);
			} else {
				for (t = ax25_route_list; t != NULL; t = t->next) {
					if (t->next == s) {
						t->next = s->next;
						kfree(s->digipeat);
						kfree(s);
						break;
					}
				}
			}
		}
	}
	write_unlock_bh(&ax25_route_lock);
}

static int __must_check ax25_rt_add(struct ax25_routes_struct *route)
{
	ax25_route *ax25_rt;
	ax25_dev *ax25_dev;
	int i;

	if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
		return -EINVAL;
	if (route->digi_count > AX25_MAX_DIGIS)
		return -EINVAL;

	write_lock_bh(&ax25_route_lock);

	ax25_rt = ax25_route_list;
	while (ax25_rt != NULL) {
		if (ax25cmp(&ax25_rt->callsign, &route->dest_addr) == 0 &&
			    ax25_rt->dev == ax25_dev->dev) {
			kfree(ax25_rt->digipeat);
			ax25_rt->digipeat = NULL;
			if (route->digi_count != 0) {
				if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
					write_unlock_bh(&ax25_route_lock);
					return -ENOMEM;
				}
				ax25_rt->digipeat->lastrepeat = -1;
				ax25_rt->digipeat->ndigi      = route->digi_count;
				for (i = 0; i < route->digi_count; i++) {
					ax25_rt->digipeat->repeated[i] = 0;
					ax25_rt->digipeat->calls[i]    = route->digi_addr[i];
				}
			}
			write_unlock_bh(&ax25_route_lock);
			return 0;
		}
		ax25_rt = ax25_rt->next;
	}

	if ((ax25_rt = kmalloc(sizeof(ax25_route), GFP_ATOMIC)) == NULL) {
		write_unlock_bh(&ax25_route_lock);
		return -ENOMEM;
	}

	atomic_set(&ax25_rt->refcount, 1);
	ax25_rt->callsign     = route->dest_addr;
	ax25_rt->dev          = ax25_dev->dev;
	ax25_rt->digipeat     = NULL;
	ax25_rt->ip_mode      = ' ';
	if (route->digi_count != 0) {
		if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
			write_unlock_bh(&ax25_route_lock);
			kfree(ax25_rt);
			return -ENOMEM;
		}
		ax25_rt->digipeat->lastrepeat = -1;
		ax25_rt->digipeat->ndigi      = route->digi_count;
		for (i = 0; i < route->digi_count; i++) {
			ax25_rt->digipeat->repeated[i] = 0;
			ax25_rt->digipeat->calls[i]    = route->digi_addr[i];
		}
	}
	ax25_rt->next   = ax25_route_list;
	ax25_route_list = ax25_rt;
	write_unlock_bh(&ax25_route_lock);

	return 0;
}

void __ax25_put_route(ax25_route *ax25_rt)
{
	kfree(ax25_rt->digipeat);
	kfree(ax25_rt);
}

static int ax25_rt_del(struct ax25_routes_struct *route)
{
	ax25_route *s, *t, *ax25_rt;
	ax25_dev *ax25_dev;

	if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
		return -EINVAL;

	write_lock_bh(&ax25_route_lock);

	ax25_rt = ax25_route_list;
	while (ax25_rt != NULL) {
		s       = ax25_rt;
		ax25_rt = ax25_rt->next;
		if (s->dev == ax25_dev->dev &&
		    ax25cmp(&route->dest_addr, &s->callsign) == 0) {
			if (ax25_route_list == s) {
				ax25_route_list = s->next;
				ax25_put_route(s);
			} else {
				for (t = ax25_route_list; t != NULL; t = t->next) {
					if (t->next == s) {
						t->next = s->next;
						ax25_put_route(s);
						break;
					}
				}
			}
		}
	}
	write_unlock_bh(&ax25_route_lock);

	return 0;
}

static int ax25_rt_opt(struct ax25_route_opt_struct *rt_option)
{
	ax25_route *ax25_rt;
	ax25_dev *ax25_dev;
	int err = 0;

	if ((ax25_dev = ax25_addr_ax25dev(&rt_option->port_addr)) == NULL)
		return -EINVAL;

	write_lock_bh(&ax25_route_lock);

	ax25_rt = ax25_route_list;
	while (ax25_rt != NULL) {
		if (ax25_rt->dev == ax25_dev->dev &&
		    ax25cmp(&rt_option->dest_addr, &ax25_rt->callsign) == 0) {
			switch (rt_option->cmd) {
			case AX25_SET_RT_IPMODE:
				switch (rt_option->arg) {
				case ' ':
				case 'D':
				case 'V':
					ax25_rt->ip_mode = rt_option->arg;
					break;
				default:
					err = -EINVAL;
					goto out;
				}
				break;
			default:
				err = -EINVAL;
				goto out;
			}
		}
		ax25_rt = ax25_rt->next;
	}

out:
	write_unlock_bh(&ax25_route_lock);
	return err;
}

int ax25_rt_ioctl(unsigned int cmd, void __user *arg)
{
	struct ax25_route_opt_struct rt_option;
	struct ax25_routes_struct route;

	switch (cmd) {
	case SIOCADDRT:
		if (copy_from_user(&route, arg, sizeof(route)))
			return -EFAULT;
		return ax25_rt_add(&route);

	case SIOCDELRT:
		if (copy_from_user(&route, arg, sizeof(route)))
			return -EFAULT;
		return ax25_rt_del(&route);

	case SIOCAX25OPTRT:
		if (copy_from_user(&rt_option, arg, sizeof(rt_option)))
			return -EFAULT;
		return ax25_rt_opt(&rt_option);

	default:
		return -EINVAL;
	}
}

#ifdef CONFIG_PROC_FS

static void *ax25_rt_seq_start(struct seq_file *seq, loff_t *pos)
	__acquires(ax25_route_lock)
{
	struct ax25_route *ax25_rt;
	int i = 1;

	read_lock(&ax25_route_lock);
	if (*pos == 0)
		return SEQ_START_TOKEN;

	for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
		if (i == *pos)
			return ax25_rt;
		++i;
	}

	return NULL;
}

static void *ax25_rt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	++*pos;
	return (v == SEQ_START_TOKEN) ? ax25_route_list :
		((struct ax25_route *) v)->next;
}

static void ax25_rt_seq_stop(struct seq_file *seq, void *v)
	__releases(ax25_route_lock)
{
	read_unlock(&ax25_route_lock);
}

static int ax25_rt_seq_show(struct seq_file *seq, void *v)
{
	char buf[11];

	if (v == SEQ_START_TOKEN)
		seq_puts(seq, "callsign  dev  mode digipeaters\n");
	else {
		struct ax25_route *ax25_rt = v;
		const char *callsign;
		int i;

		if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0)
			callsign = "default";
		else
			callsign = ax2asc(buf, &ax25_rt->callsign);

		seq_printf(seq, "%-9s %-4s",
			callsign,
			ax25_rt->dev ? ax25_rt->dev->name : "???");

		switch (ax25_rt->ip_mode) {
		case 'V':
			seq_puts(seq, "   vc");
			break;
		case 'D':
			seq_puts(seq, "   dg");
			break;
		default:
			seq_puts(seq, "    *");
			break;
		}

		if (ax25_rt->digipeat != NULL)
			for (i = 0; i < ax25_rt->digipeat->ndigi; i++)
				seq_printf(seq, " %s",
				     ax2asc(buf, &ax25_rt->digipeat->calls[i]));

		seq_puts(seq, "\n");
	}
	return 0;
}

static const struct seq_operations ax25_rt_seqops = {
	.start = ax25_rt_seq_start,
	.next = ax25_rt_seq_next,
	.stop = ax25_rt_seq_stop,
	.show = ax25_rt_seq_show,
};

static int ax25_rt_info_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &ax25_rt_seqops);
}

const struct file_operations ax25_route_fops = {
	.owner = THIS_MODULE,
	.open = ax25_rt_info_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = seq_release,
};

#endif

/*
 *	Find AX.25 route
 *
 *	Only routes with a reference count of zero can be destroyed.
 */
ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev)
{
	ax25_route *ax25_spe_rt = NULL;
	ax25_route *ax25_def_rt = NULL;
	ax25_route *ax25_rt;

	read_lock(&ax25_route_lock);
	/*
	 *	Bind to the physical interface we heard them on, or the default
	 *	route if none is found;
	 */
	for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
		if (dev == NULL) {
			if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev != NULL)
				ax25_spe_rt = ax25_rt;
			if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev != NULL)
				ax25_def_rt = ax25_rt;
		} else {
			if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev == dev)
				ax25_spe_rt = ax25_rt;
			if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev == dev)
				ax25_def_rt = ax25_rt;
		}
	}

	ax25_rt = ax25_def_rt;
	if (ax25_spe_rt != NULL)
		ax25_rt = ax25_spe_rt;

	if (ax25_rt != NULL)
		ax25_hold_route(ax25_rt);

	read_unlock(&ax25_route_lock);

	return ax25_rt;
}

/*
 *	Adjust path: If you specify a default route and want to connect
 *      a target on the digipeater path but w/o having a special route
 *	set before, the path has to be truncated from your target on.
 */
static inline void ax25_adjust_path(ax25_address *addr, ax25_digi *digipeat)
{
	int k;

	for (k = 0; k < digipeat->ndigi; k++) {
		if (ax25cmp(addr, &digipeat->calls[k]) == 0)
			break;
	}

	digipeat->ndigi = k;
}


/*
 *	Find which interface to use.
 */
int ax25_rt_autobind(ax25_cb *ax25, ax25_address *addr)
{
	ax25_uid_assoc *user;
	ax25_route *ax25_rt;
	int err = 0;

	if ((ax25_rt = ax25_get_route(addr, NULL)) == NULL)
		return -EHOSTUNREACH;

	if ((ax25->ax25_dev = ax25_dev_ax25dev(ax25_rt->dev)) == NULL) {
		err = -EHOSTUNREACH;
		goto put;
	}

	user = ax25_findbyuid(current_euid());
	if (user) {
		ax25->source_addr = user->call;
		ax25_uid_put(user);
	} else {
		if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
			err = -EPERM;
			goto put;
		}
		ax25->source_addr = *(ax25_address *)ax25->ax25_dev->dev->dev_addr;
	}

	if (ax25_rt->digipeat != NULL) {
		ax25->digipeat = kmemdup(ax25_rt->digipeat, sizeof(ax25_digi),
					 GFP_ATOMIC);
		if (ax25->digipeat == NULL) {
			err = -ENOMEM;
			goto put;
		}
		ax25_adjust_path(addr, ax25->digipeat);
	}

	if (ax25->sk != NULL) {
		bh_lock_sock(ax25->sk);
		sock_reset_flag(ax25->sk, SOCK_ZAPPED);
		bh_unlock_sock(ax25->sk);
	}

put:
	ax25_put_route(ax25_rt);

	return err;
}

struct sk_buff *ax25_rt_build_path(struct sk_buff *skb, ax25_address *src,
	ax25_address *dest, ax25_digi *digi)
{
	struct sk_buff *skbn;
	unsigned char *bp;
	int len;

	len = digi->ndigi * AX25_ADDR_LEN;

	if (skb_headroom(skb) < len) {
		if ((skbn = skb_realloc_headroom(skb, len)) == NULL) {
			printk(KERN_CRIT "AX.25: ax25_dg_build_path - out of memory\n");
			return NULL;
		}

		if (skb->sk != NULL)
			skb_set_owner_w(skbn, skb->sk);

		kfree_skb(skb);

		skb = skbn;
	}

	bp = skb_push(skb, len);

	ax25_addr_build(bp, src, dest, digi, AX25_COMMAND, AX25_MODULUS);

	return skb;
}

/*
 *	Free all memory associated with routing structures.
 */
void __exit ax25_rt_free(void)
{
	ax25_route *s, *ax25_rt = ax25_route_list;

	write_lock_bh(&ax25_route_lock);
	while (ax25_rt != NULL) {
		s       = ax25_rt;
		ax25_rt = ax25_rt->next;

		kfree(s->digipeat);
		kfree(s);
	}
	write_unlock_bh(&ax25_route_lock);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This program is free software; you can redistribute it and/or modify
	3	* it under the terms of the GNU General Public License as published by
	4	* the Free Software Foundation; either version 2 of the License, or
	5	* (at your option) any later version.
	6	*
	7	* Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
	8	* Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
	9	* Copyright (C) Steven Whitehouse GW7RRM (stevew@acm.org)
	10	* Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
	11	* Copyright (C) Hans-Joachim Hetscher DD8NE (dd8ne@bnv-bamberg.de)
	12	* Copyright (C) Frederic Rible F1OAT (frible@teaser.fr)
	13	*/
4fc268d2 RD	14
4fc268d2 RD	15	#include <linux/capability.h>
1da177e4 LT	16	#include <linux/errno.h>
	17	#include <linux/types.h>
	18	#include <linux/socket.h>
	19	#include <linux/timer.h>
	20	#include <linux/in.h>
	21	#include <linux/kernel.h>
	22	#include <linux/sched.h>
	23	#include <linux/string.h>
	24	#include <linux/sockios.h>
	25	#include <linux/net.h>
5a0e3ad6	26	#include <linux/slab.h>
1da177e4 LT	27	#include <net/ax25.h>
	28	#include <linux/inet.h>
	29	#include <linux/netdevice.h>
	30	#include <linux/if_arp.h>
	31	#include <linux/skbuff.h>
	32	#include <linux/spinlock.h>
	33	#include <net/sock.h>
	34	#include <asm/uaccess.h>
	35	#include <asm/system.h>
	36	#include <linux/fcntl.h>
	37	#include <linux/mm.h>
	38	#include <linux/interrupt.h>
	39	#include <linux/init.h>
	40	#include <linux/seq_file.h>
bc3b2d7f	41	#include <linux/export.h>
1da177e4 LT	42
	43	static ax25_route *ax25_route_list;
	44	static DEFINE_RWLOCK(ax25_route_lock);
	45
1da177e4 LT	46	void ax25_rt_device_down(struct net_device *dev)
	47	{
	48	ax25_route s, t, *ax25_rt;
	49
4de211f1	50	write_lock_bh(&ax25_route_lock);
1da177e4 LT	51	ax25_rt = ax25_route_list;
	52	while (ax25_rt != NULL) {
	53	s = ax25_rt;
	54	ax25_rt = ax25_rt->next;
	55
	56	if (s->dev == dev) {
	57	if (ax25_route_list == s) {
	58	ax25_route_list = s->next;
a51482bd	59	kfree(s->digipeat);
1da177e4 LT	60	kfree(s);
	61	} else {
	62	for (t = ax25_route_list; t != NULL; t = t->next) {
	63	if (t->next == s) {
	64	t->next = s->next;
a51482bd	65	kfree(s->digipeat);
1da177e4 LT	66	kfree(s);
	67	break;
	68	}
	69	}
	70	}
	71	}
	72	}
4de211f1	73	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	74	}
1da177e4 LT	75
c9266b99	76	static int __must_check ax25_rt_add(struct ax25_routes_struct *route)
1da177e4 LT	77	{
	78	ax25_route *ax25_rt;
	79	ax25_dev *ax25_dev;
	80	int i;
	81
	82	if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
	83	return -EINVAL;
	84	if (route->digi_count > AX25_MAX_DIGIS)
	85	return -EINVAL;
	86
4de211f1	87	write_lock_bh(&ax25_route_lock);
1da177e4 LT	88
	89	ax25_rt = ax25_route_list;
	90	while (ax25_rt != NULL) {
	91	if (ax25cmp(&ax25_rt->callsign, &route->dest_addr) == 0 &&
528930b9	92	ax25_rt->dev == ax25_dev->dev) {
a51482bd JJ	93	kfree(ax25_rt->digipeat);
a51482bd JJ	94	ax25_rt->digipeat = NULL;
1da177e4 LT	95	if (route->digi_count != 0) {
1da177e4 LT	96	if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
4de211f1	97	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	98	return -ENOMEM;
	99	}
	100	ax25_rt->digipeat->lastrepeat = -1;
	101	ax25_rt->digipeat->ndigi = route->digi_count;
	102	for (i = 0; i < route->digi_count; i++) {
	103	ax25_rt->digipeat->repeated[i] = 0;
	104	ax25_rt->digipeat->calls[i] = route->digi_addr[i];
	105	}
	106	}
4de211f1	107	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	108	return 0;
	109	}
	110	ax25_rt = ax25_rt->next;
	111	}
	112
	113	if ((ax25_rt = kmalloc(sizeof(ax25_route), GFP_ATOMIC)) == NULL) {
4de211f1	114	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	115	return -ENOMEM;
	116	}
	117
006f68b8	118	atomic_set(&ax25_rt->refcount, 1);
1da177e4 LT	119	ax25_rt->callsign = route->dest_addr;
	120	ax25_rt->dev = ax25_dev->dev;
	121	ax25_rt->digipeat = NULL;
	122	ax25_rt->ip_mode = ' ';
	123	if (route->digi_count != 0) {
	124	if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
4de211f1	125	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	126	kfree(ax25_rt);
	127	return -ENOMEM;
	128	}
	129	ax25_rt->digipeat->lastrepeat = -1;
	130	ax25_rt->digipeat->ndigi = route->digi_count;
	131	for (i = 0; i < route->digi_count; i++) {
	132	ax25_rt->digipeat->repeated[i] = 0;
	133	ax25_rt->digipeat->calls[i] = route->digi_addr[i];
	134	}
	135	}
	136	ax25_rt->next = ax25_route_list;
	137	ax25_route_list = ax25_rt;
4de211f1	138	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	139
	140	return 0;
	141	}
	142
006f68b8	143	void __ax25_put_route(ax25_route *ax25_rt)
1da177e4	144	{
006f68b8 RB	145	kfree(ax25_rt->digipeat);
006f68b8 RB	146	kfree(ax25_rt);
1da177e4 LT	147	}
	148
	149	static int ax25_rt_del(struct ax25_routes_struct *route)
	150	{
	151	ax25_route s, t, *ax25_rt;
	152	ax25_dev *ax25_dev;
	153
	154	if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
	155	return -EINVAL;
	156
4de211f1	157	write_lock_bh(&ax25_route_lock);
1da177e4 LT	158
	159	ax25_rt = ax25_route_list;
	160	while (ax25_rt != NULL) {
	161	s = ax25_rt;
	162	ax25_rt = ax25_rt->next;
	163	if (s->dev == ax25_dev->dev &&
	164	ax25cmp(&route->dest_addr, &s->callsign) == 0) {
	165	if (ax25_route_list == s) {
	166	ax25_route_list = s->next;
006f68b8	167	ax25_put_route(s);
1da177e4 LT	168	} else {
	169	for (t = ax25_route_list; t != NULL; t = t->next) {
	170	if (t->next == s) {
	171	t->next = s->next;
006f68b8	172	ax25_put_route(s);
1da177e4 LT	173	break;
	174	}
	175	}
	176	}
	177	}
	178	}
4de211f1	179	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	180
	181	return 0;
	182	}
	183
	184	static int ax25_rt_opt(struct ax25_route_opt_struct *rt_option)
	185	{
	186	ax25_route *ax25_rt;
	187	ax25_dev *ax25_dev;
	188	int err = 0;
	189
	190	if ((ax25_dev = ax25_addr_ax25dev(&rt_option->port_addr)) == NULL)
	191	return -EINVAL;
	192
4de211f1	193	write_lock_bh(&ax25_route_lock);
1da177e4 LT	194
	195	ax25_rt = ax25_route_list;
	196	while (ax25_rt != NULL) {
	197	if (ax25_rt->dev == ax25_dev->dev &&
	198	ax25cmp(&rt_option->dest_addr, &ax25_rt->callsign) == 0) {
	199	switch (rt_option->cmd) {
	200	case AX25_SET_RT_IPMODE:
	201	switch (rt_option->arg) {
	202	case ' ':
	203	case 'D':
	204	case 'V':
	205	ax25_rt->ip_mode = rt_option->arg;
	206	break;
	207	default:
	208	err = -EINVAL;
	209	goto out;
	210	}
	211	break;
	212	default:
	213	err = -EINVAL;
	214	goto out;
	215	}
	216	}
	217	ax25_rt = ax25_rt->next;
	218	}
	219
	220	out:
4de211f1	221	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	222	return err;
	223	}
	224
	225	int ax25_rt_ioctl(unsigned int cmd, void __user *arg)
	226	{
	227	struct ax25_route_opt_struct rt_option;
	228	struct ax25_routes_struct route;
	229
	230	switch (cmd) {
	231	case SIOCADDRT:
	232	if (copy_from_user(&route, arg, sizeof(route)))
	233	return -EFAULT;
	234	return ax25_rt_add(&route);
	235
	236	case SIOCDELRT:
	237	if (copy_from_user(&route, arg, sizeof(route)))
	238	return -EFAULT;
	239	return ax25_rt_del(&route);
	240
	241	case SIOCAX25OPTRT:
	242	if (copy_from_user(&rt_option, arg, sizeof(rt_option)))
	243	return -EFAULT;
	244	return ax25_rt_opt(&rt_option);
	245
	246	default:
	247	return -EINVAL;
	248	}
	249	}
	250
	251	#ifdef CONFIG_PROC_FS
	252
	253	static void ax25_rt_seq_start(struct seq_file seq, loff_t *pos)
f16f3026	254	__acquires(ax25_route_lock)
1da177e4 LT	255	{
	256	struct ax25_route *ax25_rt;
	257	int i = 1;
528930b9 YH	258
528930b9 YH	259	read_lock(&ax25_route_lock);
1da177e4 LT	260	if (*pos == 0)
	261	return SEQ_START_TOKEN;
	262
	263	for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
	264	if (i == *pos)
	265	return ax25_rt;
	266	++i;
	267	}
	268
	269	return NULL;
	270	}
	271
	272	static void ax25_rt_seq_next(struct seq_file seq, void v, loff_t pos)
	273	{
	274	++*pos;
528930b9	275	return (v == SEQ_START_TOKEN) ? ax25_route_list :
1da177e4 LT	276	((struct ax25_route *) v)->next;
	277	}
	278
	279	static void ax25_rt_seq_stop(struct seq_file seq, void v)
f16f3026	280	__releases(ax25_route_lock)
1da177e4 LT	281	{
	282	read_unlock(&ax25_route_lock);
	283	}
	284
	285	static int ax25_rt_seq_show(struct seq_file seq, void v)
	286	{
f75268cd RB	287	char buf[11];
f75268cd RB	288
1da177e4 LT	289	if (v == SEQ_START_TOKEN)
	290	seq_puts(seq, "callsign dev mode digipeaters\n");
	291	else {
	292	struct ax25_route *ax25_rt = v;
	293	const char *callsign;
	294	int i;
	295
	296	if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0)
	297	callsign = "default";
	298	else
f75268cd	299	callsign = ax2asc(buf, &ax25_rt->callsign);
1da177e4 LT	300
	301	seq_printf(seq, "%-9s %-4s",
	302	callsign,
	303	ax25_rt->dev ? ax25_rt->dev->name : "???");
	304
	305	switch (ax25_rt->ip_mode) {
	306	case 'V':
	307	seq_puts(seq, " vc");
	308	break;
	309	case 'D':
	310	seq_puts(seq, " dg");
	311	break;
	312	default:
	313	seq_puts(seq, " *");
	314	break;
	315	}
	316
	317	if (ax25_rt->digipeat != NULL)
	318	for (i = 0; i < ax25_rt->digipeat->ndigi; i++)
f75268cd RB	319	seq_printf(seq, " %s",
f75268cd RB	320	ax2asc(buf, &ax25_rt->digipeat->calls[i]));
1da177e4 LT	321
	322	seq_puts(seq, "\n");
	323	}
	324	return 0;
	325	}
	326
56b3d975	327	static const struct seq_operations ax25_rt_seqops = {
1da177e4 LT	328	.start = ax25_rt_seq_start,
	329	.next = ax25_rt_seq_next,
	330	.stop = ax25_rt_seq_stop,
	331	.show = ax25_rt_seq_show,
	332	};
	333
	334	static int ax25_rt_info_open(struct inode inode, struct file file)
	335	{
	336	return seq_open(file, &ax25_rt_seqops);
	337	}
	338
9a32144e	339	const struct file_operations ax25_route_fops = {
1da177e4 LT	340	.owner = THIS_MODULE,
	341	.open = ax25_rt_info_open,
	342	.read = seq_read,
	343	.llseek = seq_lseek,
	344	.release = seq_release,
	345	};
	346
	347	#endif
	348
	349	/*
	350	* Find AX.25 route
	351	*
3f072310	352	* Only routes with a reference count of zero can be destroyed.
1da177e4	353	*/
006f68b8	354	ax25_route ax25_get_route(ax25_address addr, struct net_device *dev)
1da177e4 LT	355	{
	356	ax25_route *ax25_spe_rt = NULL;
	357	ax25_route *ax25_def_rt = NULL;
	358	ax25_route *ax25_rt;
	359
	360	read_lock(&ax25_route_lock);
	361	/*
	362	* Bind to the physical interface we heard them on, or the default
	363	* route if none is found;
	364	*/
	365	for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
	366	if (dev == NULL) {
	367	if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev != NULL)
	368	ax25_spe_rt = ax25_rt;
	369	if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev != NULL)
	370	ax25_def_rt = ax25_rt;
	371	} else {
	372	if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev == dev)
	373	ax25_spe_rt = ax25_rt;
	374	if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev == dev)
	375	ax25_def_rt = ax25_rt;
	376	}
	377	}
	378
	379	ax25_rt = ax25_def_rt;
	380	if (ax25_spe_rt != NULL)
	381	ax25_rt = ax25_spe_rt;
	382
	383	if (ax25_rt != NULL)
006f68b8	384	ax25_hold_route(ax25_rt);
1da177e4 LT	385
	386	read_unlock(&ax25_route_lock);
	387
	388	return ax25_rt;
	389	}
	390
	391	/*
	392	* Adjust path: If you specify a default route and want to connect
	393	* a target on the digipeater path but w/o having a special route
	394	* set before, the path has to be truncated from your target on.
	395	*/
	396	static inline void ax25_adjust_path(ax25_address addr, ax25_digi digipeat)
	397	{
	398	int k;
	399
	400	for (k = 0; k < digipeat->ndigi; k++) {
	401	if (ax25cmp(addr, &digipeat->calls[k]) == 0)
	402	break;
	403	}
	404
	405	digipeat->ndigi = k;
	406	}
	407
	408
	409	/*
	410	* Find which interface to use.
	411	*/
	412	int ax25_rt_autobind(ax25_cb ax25, ax25_address addr)
	413	{
01d7dd0e	414	ax25_uid_assoc *user;
1da177e4	415	ax25_route *ax25_rt;
b3d18f15	416	int err = 0;
1da177e4 LT	417
	418	if ((ax25_rt = ax25_get_route(addr, NULL)) == NULL)
	419	return -EHOSTUNREACH;
	420
	421	if ((ax25->ax25_dev = ax25_dev_ax25dev(ax25_rt->dev)) == NULL) {
	422	err = -EHOSTUNREACH;
	423	goto put;
	424	}
	425
73400407	426	user = ax25_findbyuid(current_euid());
01d7dd0e RB	427	if (user) {
	428	ax25->source_addr = user->call;
	429	ax25_uid_put(user);
	430	} else {
1da177e4 LT	431	if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
	432	err = -EPERM;
	433	goto put;
	434	}
01d7dd0e	435	ax25->source_addr = (ax25_address )ax25->ax25_dev->dev->dev_addr;
1da177e4 LT	436	}
1da177e4 LT	437
1da177e4	438	if (ax25_rt->digipeat != NULL) {
0459d70a ACM	439	ax25->digipeat = kmemdup(ax25_rt->digipeat, sizeof(ax25_digi),
	440	GFP_ATOMIC);
	441	if (ax25->digipeat == NULL) {
1da177e4 LT	442	err = -ENOMEM;
	443	goto put;
	444	}
1da177e4 LT	445	ax25_adjust_path(addr, ax25->digipeat);
	446	}
	447
	448	if (ax25->sk != NULL) {
	449	bh_lock_sock(ax25->sk);
	450	sock_reset_flag(ax25->sk, SOCK_ZAPPED);
	451	bh_unlock_sock(ax25->sk);
	452	}
	453
	454	put:
	455	ax25_put_route(ax25_rt);
	456
b3d18f15	457	return err;
1da177e4 LT	458	}
1da177e4 LT	459
1da177e4 LT	460	struct sk_buff ax25_rt_build_path(struct sk_buff skb, ax25_address *src,
	461	ax25_address dest, ax25_digi digi)
	462	{
	463	struct sk_buff *skbn;
	464	unsigned char *bp;
	465	int len;
	466
	467	len = digi->ndigi * AX25_ADDR_LEN;
	468
	469	if (skb_headroom(skb) < len) {
	470	if ((skbn = skb_realloc_headroom(skb, len)) == NULL) {
	471	printk(KERN_CRIT "AX.25: ax25_dg_build_path - out of memory\n");
	472	return NULL;
	473	}
	474
	475	if (skb->sk != NULL)
	476	skb_set_owner_w(skbn, skb->sk);
	477
	478	kfree_skb(skb);
	479
	480	skb = skbn;
	481	}
	482
	483	bp = skb_push(skb, len);
	484
	485	ax25_addr_build(bp, src, dest, digi, AX25_COMMAND, AX25_MODULUS);
	486
	487	return skb;
	488	}
	489
	490	/*
	491	* Free all memory associated with routing structures.
	492	*/
	493	void __exit ax25_rt_free(void)
	494	{
	495	ax25_route s, ax25_rt = ax25_route_list;
	496
4de211f1	497	write_lock_bh(&ax25_route_lock);
1da177e4 LT	498	while (ax25_rt != NULL) {
	499	s = ax25_rt;
	500	ax25_rt = ax25_rt->next;
	501
a51482bd	502	kfree(s->digipeat);
1da177e4 LT	503	kfree(s);
1da177e4 LT	504	}
4de211f1	505	write_unlock_bh(&ax25_route_lock);
1da177e4	506	}